We are slowly destroying the earth. The seas and the rivers are too dirty to swim in. There is so much smoke in the air that it is unhealthy to live in many of the world’s cities. In one well-known city, for example, poisonous gases from cars pollute the air so much that traffic policemen have to wear oxygen masks.

We have cut down so many trees that there are now vast areas of waste-land all over the world. As the result, farmers in parts of Africa cannot grow enough to eat. In certain countries in Asia there is too little rice. Moreover, we do not take enough care of the countryside. Wild animals are quickly disappearing. For instance, tigers are rare in India now because we have killed too many to survive. However, it is not enough simply to talk about the problem. We must act now before it is too late to do anything about it. Join us now. Save the Earth. This is too important to ignore.

Conservation, sustainable use and protection of (26)………….. resources include plants, animals, mineral deposits, soil, clean (27)………….., clean air and fossil fuels such as coal, petroleum, and natural gas. Natural (28)………….. are grouped into two categories, renewable and non-renewable. A (29)………….. resource is one that may be replaced over time by natural, such as fish populations, solar anergy, wind and water power and natual vegetable. (30)………….. resources are those in limited supply and cannot be replaced, such as coal, petroleum, and natural gas.